Earth:Almond Formation
| Almond Formation Stratigraphic range: Campanian–Maastrichtian 73.6–71.1 Ma | |
|---|---|
| Type | Geological formation |
| Underlies | Lewis Shale |
| Overlies | Ericson Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone, shale, coalb |
| Location | |
| Region | Wyoming |
| Country | United States |
The Almond Formation is a geological formation of Late Cretaceous (Late Campanian-Early Maastrichtian[1]) age in Wyoming. It was deposited in marsh, deltaic, lagoonal, estuarine, and shallow marine environments along the western shore of the Western Interior Seaway. It consists primarily of fine- to medium-grained sandstone, siltstone, shale, and coal.[2] Fossils from the Almond Formation include remains of dinosaurs[3] and plants.[4]
Vertebrate paleofauna
Dinosaurs
Color key
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Notes Uncertain or tentative taxa are in small text; |
| Dinosaurs of the Almond Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|
Indeterminate |
Represents a new genus and species of unnamed ceratopsid |
     | ||||
|
Indeterminate[5] |
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|
Indeterminate[5] |
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|
Indeterminate[5] |
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|
Indeterminate[5] |
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|
P. lacustris[5] |
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| Saurolophus[6] | S. sp. | One specimen (AMNH 3651) consisting of partial cranial and postcranial remains, as well as skin impressions | ||||
|
Indeterminate[7] |
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|
Unnamed chasmosaurine ceratopsid[8] |
Unnamed |
Misidentified as Anchiceratops, it is actually a new species of Pentaceratops-like form that is the sister taxon to Bisticeratops.[9] Holotype was discovered in 1937. | ||||
Other vertebrates
Non-dinosaur vertebrates found in the Almond Formation include crocodyliforms (indet.), turtles (Adocus cf. and Basilemys cf.), and ray-finned fish (Ichthyodectidae indet.).[10]
See also
- List of dinosaur-bearing rock formations
Footnotes
- ↑ Fowler, Denver Warwick (2017-11-22). "Revised geochronology, correlation, and dinosaur stratigraphic ranges of the Santonian-Maastrichtian (Late Cretaceous) formations of the Western Interior of North America". PLOS ONE 12 (11). doi:10.1371/journal.pone.0188426. ISSN 1932-6203. PMID 29166406. Bibcode: 2017PLoSO..1288426F.
- ↑ Kieft, R.L., Hampton, G.J., Jackson, C.A.-L., and Larsen, E., 2011. Stratigraphic architecture of a net-transgressive marginal- to shallow-marine succession: Upper Almond Formation, Rock Springs Uplift, Wyoming, U.S.A. Journal of Sedimentary Research, vol. 81, p. 513-533.
- ↑ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
- ↑ Stockey, R.A., Rothwell, G.W., and Johnson, K.R., 2007. Cobbania corrugata gen. et. comb. nov. (Araceae): A floating aquatic monocot from the Upper Cretaceous of western North America. American Journal of Botany, vol. 94, no. 4, p. 609-624.
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 "3.12 Wyoming, United States; 4. Almond Formation," in Weishampel, et al. (2004). Page 584.
- ↑ Gates, T. A.; Farke, A. A. (2009-10-01). "Biostratigraphic and biogeographic implications of a hadrosaurid (Ornithopoda: Dinosauria) from the Upper Cretaceous Almond Formation of Wyoming, USA". Cretaceous Research 30 (5): 1157–1163. doi:10.1016/j.cretres.2009.05.001. ISSN 0195-6671. https://linkinghub.elsevier.com/retrieve/pii/S0195667109000536.
- ↑ 7.0 7.1 Listed as "cf. Thescelosaurus sp." in "3.12 Wyoming, United States; 4. Almond Formation," in Weishampel, et al. (2004). Page 584.
- ↑ Listed as "?Anchiceratops sp." in "3.12 Wyoming, United States; 4. Almond Formation," in Weishampel, et al. (2004). Page 584.
- ↑ "A new chasmosaurine ceratopsid from the Upper Cretaceous (Campanian) Farmington Member of the Kirtland Formation, New Mexico". New Mexico Museum of Natural History and Science Bulletin 90: 127-153. 2022. https://www.researchgate.net/publication/362680358_A_NEW_CHASMOSAURINE_CERATOPSID_FROM_THE_UPPER_CRETACEOUS_CAMPANIAN_FARMINGTON_MEMBER_OF_THE_KIRTLAND_FORMATION_NEW_MEXICO.
- ↑ Cowgill, Ethan; Ashurst-mcgee, Logan; Storrs, Glenn; Johnson, Christopher L.; Affolter, Matthew D.; Law, Lane; Hawkins, Quinlan; Tamez-Galvan, Evan et al. (2021). "A PRELIMINARY REPORT ON NEW VERTEBRATE FOSSILS FROM THE LATE CRETACEOUS ALMOND FORMATION, WYOMING". Geological Society of America Abstracts with Programs 53 (6). doi:10.1130/abs/2021AM-371282. https://gsa.confex.com/gsa/2021AM/webprogram/Paper371282.html.
References
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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